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� 1 <br /> A S S O C I A T E S I N C <br /> ♦ Cntenon b <br /> The long-term effectiveness for soli and groundwater remediation would be fair to good <br />' depending upon the degree of contaminant removal Groundwater would be monitored <br /> penodlcally until soil and groundwater is remediated to ensure that concentrations of petroleum <br /> hydrocarbons are being reduced <br /> ♦ Cntenon 7 <br /> This alternative has some minor implementabdity problems due to the time involved in <br /> ' obtaining permits from the Air Pollution Control Istria (APCD) for the vapor extraction <br /> system Permitting could take as much as Igo days depending upon APCD work load, but is <br /> ' typically completed in 60 to 90 days <br /> ♦ Casterton 8 <br /> Iinpact to the site occupants and surrounding businesses during installation and other site <br /> ' activities will be moderate Groundwater extraction alone is generally ineffective in reducing <br /> concentrations but soil vapor extraction enhances this alternative Regulatory acceptance <br /> would be expected with some reservations <br /> 6.3 In-Situ Air Sparging with Soil Vapor Extraction <br /> ♦ Cntenon 1 <br /> This alternative has muumal health-based risks Petroleum hydrocarbons are removed from <br /> extracted vapor prior to release to the atmosphere eliminating the risk of exposure to humans <br /> Groundwater would be monitored periodically to ensure that reduction is occurring The <br /> potential fire or explosion hazard is minimal with a properly designed system and regularly <br /> ischeduled monitoring and maintenance <br /> ' ♦ Casterton 2 <br /> Vapor extraction and air spargmg would reduce the level of toxicity, mobility and volume of <br /> contaminants in the soil and groundwater to levels acceptable to regulatory agencies Pilot <br /> testing has shown that preferential airflow pathways exist at the site so the network of sparge <br /> ' and vapor extraction wells would have to be carefully designed to prevent migration of the <br /> plume <br /> ♦ Cntenon 3 <br /> This alternative can be implemented within regulatory guidelines <br /> ♦ Cntenon 4 <br /> remediation alternative would require the installation <br /> The soil vapor extraction and air sparging <br /> ' of additional vapor extraction and sparge wells, air injection and vapor extraction equipment, <br /> and the abatement equipment Vapor-phase carbon can likely be used initially for the treatment <br /> of off-gases but may be removed after concentrations are reduced to levels acceptable to the <br /> regulatory agencies It may be necessary to utilize another off-gas abatement method, winch <br /> W 162574 01\pilot-fa report doe 13 <br />